Compressed air drain opening device

Abstract

An air plunger is described. The air plunger comprises an upper barrel and a lower barrel slidably received by the upper barrel. An air seal is fixed to the lower barrel and slidably engages with the upper barrel. A nozzle is attached to the lower barrel opposite to the upper barrel. A stop mechanism prohibits the upper barrel from disassociating with the lower barrel.

The invention claimed is: 
     
       1. An air plunger comprising:
 a first barrel; 
 a second barrel slidably attached to said first barrel; 
 a unidirectional seal slidably engaged with said first barrel; 
 a plunger bell attached to said first barrel; and 
 a ledge for prohibiting said second barrel from disassociating with said first barrel. 
 
     
     
       2. The air plunger of  claim 1  wherein said unidirectional seal engages with an inner wall of said first barrel as said second barrel moves towards said plunger bell and disengages with said inner wall of said first barrel when said second barrel moves away from said plunger bell. 
     
     
       3. The air plunger of  claim 1  further comprising a support post wherein said unidirectional seal and said second barrel receive said support post. 
     
     
       4. The air plunger of  claim 3  further comprising a disk between said unidirectional seal and said second barrel and said disk receives said support post. 
     
     
       5. The air plunger of  claim 1  wherein said bell plunger comprises a base with at least one concentric ridge on said base. 
     
     
       6. The air plunger of  claim 5  wherein said bell plunger comprises multiple concentric ridges. 
     
     
       7. The air plunger of  claim 1  wherein said unidirectional seal allows no more than about one inch of water to be drawn in to said first barrel. 
     
     
       8. The air plunger of  claim 7  wherein said unidirectional seal allows no more than about one-half inch of water to be drawn in to said first barrel.